Quick question

Looking to spend little on new grow room I had to build when habitat starting gassing plants......what is going to be the cheapest way to cover 4X4X8 closet with reflective material....would it be mylar, paint or is something else?? If it is mylar, what's the best, least expensive source....and if it's paint, what is the best type....THANKS MUCH!!!

The best thing to do is in fact the easiest and cheapest, Just gloss white paint for the best reflective surface

gloss white paint is the way to go. the cheapest way out is wrapping paper... turn it so the back (white reflective) side is facing your goods. It's a lot less work also compared to painting a room.

Elastomere paint
A rubberized roofing paint with 90% reflection. Good for growboxes. Mildew resistant. Highly reflective.
Kool Seal White Elastomeric Roof Coating ~ $15.00 (1 Gallon)
Ultra high reflectivity
Forms a rubber-like blanket that expands and contracts
Adheres to almost any surface (very good on wood and metal)
Available @ Lowe's

Anyone experienced this??